I am unable to get details of particular channel.

I am unable to get details of particular channel.

I see the following error.
https://cliq.zoho.com/api/v2/chats/{chat-id}/messages?fromtime=1546344120000&limit=1000

{
    "message": "Sorry! Looks like you are not part of this channel.",
    "code": "not_channel_user"
}
Also, I notice that I am not able to view all the channels of my organization as well.
I only see a couple. Do I need any additional permissions for that.